stage_max(5)
stage_start()
stage_continue()

premium_page(premium.htm)

lifeup_score()

ball_count()
ball_speed()
ball_radius()
ball_color()

power_effect()

bar_length()
bar_color()
bar_overhang()

direction_up()
direction_down()
direction_left()
direction_right()

back_color()
back_image()

clear_rate()
front_line()

item_rate()

item_barlong()
item_barshort()
item_ballbig()
item_ballsmall()
item_speedup()
item_speeddown()
item_blockhide(2)
item_gothrough()
item_keepin()
item_lifeup()
item_lifedown()
item_blockincrease()
item_blockdecrease()
item_scoreup()
item_scoredown()
item_ballincrease()
